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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Income Taxes [Line Items]        
Federal corporate income tax rate   21.00% 35.00%  
Reduction of net deferred tax liabilities $ 31 $ 120 $ 12,682  
Deferred tax liability attributable to temporary differences in other comprehensive income 118      
Change in net deferred tax liability related to acquisitions 1,000      
Net deferred tax liability, franchise rights 15,400      
Liability for uncertain tax positions 1,013 1,012 $ 809  
Unrecognized tax benefits that would impact effective tax rate 1,100      
Unrecognized tax benefits, interest on income taxes accrued 186 $ 203    
Federal Tax Authority [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards 274      
Foreign Tax Authority [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards $ 5,600      
Sky Limited [Member]        
Income Taxes [Line Items]        
Deferred tax assets related to net operating losses       $ 1,200